Etiquette when other people are swearing around your baby?

[HaileysMom]

I was just at a mom & baby movie and was in line to buy some popcorn. The woman behind me - carrying her newish baby in his carseat - starting swearing up a storm. My daughter is almost 6 months and we are doing our best to watch our language in front of her.

The woman didn't just swear once. She started talking about that Sarah Silverman/Matt Damon video, and then the Jimmy Kimmel/Ben Affleck video, and then actually started singing them...yowzers.

What should a mother do in this circumstance? Leave it alone? Ask them to politely watch their language on mom & baby day? I know my daughter is only 6 months but she is starting to understand many words we use with her. I don't want her first words to be "I'm f*cking Matt Damon..."